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3 Jun 2018
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Join Date: Jul 2003
Location: Mimbres, New Mexico, USA
Posts: 511
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Quote:
Originally Posted by JMo (& piglet)
fwiw. I speculated that this new Honda is likely to have the same sort of short-throttle stop that the Euro-homologated WR450F comes with, and also KTM EXCs (although these are almost always removed prior to actual sale/delivery) - it's a way to keep the drive-by noise low on competition-enduro derived machines, by restricting the maximum RPM mechanically.
Sure enough, someone better than me at maths over on ADVrider crunched the number recently:
Power = torque × revs ÷ 9548.8
Assuming the (peak) torque figure of 32nm is correct, to get 18.4kw we need to be at 5500rpm. Seems way too low to me for peak power.
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The problem with this calculation is that Honda hasn't told us what rpm the HP and Torque numbers occur at. Peak torque and HP seldom if ever occur at the same RPM.In order to solve the above equation for RPM, we would have to know torque and HP at the same RPM, or peak torque and HP at their different RPM, and that is not provided by Honda in anything I have seen yet.
Inertial dynos work by measuring the rate of acceleration of a known mass (the drum) through an RPM range, to get a HP curve, then a Torque curve is calculated from HP and RPM.
Think of it this way, after the RPM that peak torque occurs, HP can and usually does, continue to rise with RPM, because RPM is rising faster than torque is falling, at least to a point.
Anyway, the point is, the data we have to work with is incomplete.
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